One-pot synthesis of reduced graphene oxide nanosheets anchored ZnO nanoparticles via microwave approach for electrochem
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One‑pot synthesis of reduced graphene oxide nanosheets anchored ZnO nanoparticles via microwave approach for electrochemical performance as supercapacitor electrode Rajesh Kumar1 · Sally M. Youssry1,2 · Mohamed M. Abdel‑Galeil2 · Atsunori Matsuda1 Received: 27 June 2020 / Accepted: 25 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this article, we have demonstrated single-step as well as scalable synthesis of zinc oxide nanoparticles (ZnO NPs) supported on highly thin/transparent reduced graphene oxide (rGO) nanocomposite (ZnO@rGO) via direct microwave irradiation using decomposition of zinc acetate dihydrate (Zn(CH3CO2)2·2H2O) along with reduction of graphite oxide. The surface microstructure of prepared ZnO@rGO nanocomposite was analyzed by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, Raman spectroscopy, and X-ray photo electron spectroscopy. Different characterization analysis indicates that the ZnO NPs in the nanocomposite were dispersed on the surfaces of rGO nanosheets (NSs). Raman spectra reveal the structural defects level of rGO NSs was 0.78, while it was increased to 1.66 for ZnO@rGO nanocomposites. The synthesized ZnO@rGO nanocomposite exhibits specific capacitance of 102.4 F/g at the scan rate of 30 mV/s and shows good cyclic stability of 82.5% for 3000 cycles at high scan rate 100 mV/s.
1 Introduction Nowadays, electrode materials for supercapacitors (SCs) have attracted high curiosity due to their significant potential application for energy related applications [1–3]. Electrochemical energy storage device as SCs containing ultrahigh life cycle and superior power density plays a significant role in electrical vehicles, electronic devices, and power backup [2, 4]. To achieve high performance for SCs application, the surface area of active electrode should be high to accommodate large number of electrolyte ions on surface. To improve the performance of SC, different kinds of materials as high surface area containing carbon materials (active carbon, carbon aerogels, carbon nanotubes, and mesoporous carbon etc.), transition metal oxides, and conducting polymers are * Rajesh Kumar [email protected] * Atsunori Matsuda [email protected] 1
Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1‑1 Hibarigaoka, Tempaku‑cho, Toyohashi, Aichi 441‑8580, Japan
Department of Chemistry, Faculty of Science, Tanta University, Tanta 31527, Egypt
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extensively studied for electrode purpose [5–12]. Different types of metal oxides have been used with carbon-based materials to enhance the performance because it pays pseudocapacitance to entire capacitance separately from the double-layer capacitance [13–16]. The electrochemical properties of SCs are generally affected by the internal and surface structures of electrode materials. The electrode materials for SC with low-cost production and porous internal structure are interesting in the field of energy storage devices. Among di
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